http://www.starharbornights.com/ - Mosiac-style superhero storytelling in a modern world, by one of the most prolific and amazing writers I have ever read.

http://www.crystalhall.org/stories.html - Whateley Academy, a collection of teenage mutant superkid stories, admittedly all centering around transgender characters but awesome enough that anyone can enjoy them, IMO. Loads of references to various mythos, from Lovecraft to Christianity to anime.

Both of these have given me all sorts of fun ideas for superhero characters! If you know of any more inspirational resources, feel free to share them, I'd love to find more!